VM/CMS Client/Server model

Traditional paradigm in VM

1. VM/CMS has provided "LAN-like" client-server facilities for many years
   • print and file transmission
   • file and database managers
   • security and accounting managers
   • communications servers
   • IBM, OEM, and user applications
2. VM supports both local and remote clients
   • Within a VM system or collection of VM systems
   • Peer-to-peer via TCP/IP and other protocols
   • Peer-to-peer via LU6.2 to SNA partners
   • Two-phase commit control for safe updating in SFS and SQL/DS

VM is the originator of client-server

VM originated the equivalent of the LAN connectivity and program-to-program communications that were rediscovered years later with personal computers and Unix workstations. This inspired the client-server style of computing that was rediscovered in the late 1980s.

Not surprisingly, VM has well-tested, efficient, and robust facilities for constructing and supporting client-server computing with a wide range of protocols. These have been extended VM application capabilities from VM-only interfaces, such as IUCV, to multi-platform interfaces such as TCP/IP socket and RPC, and SNA's LU6.2 and APPC.

Today, with the excitement over the World Wide Web, VM delivers even more capability via VM Web servers that can interact with VM/CMS files, applications in REXX and CMS Pipelines, and even DB2 databases.

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